Computational study of the collapse of a cloud with 12500 gas bubbles in a liquid

U. Rasthofer, F. Wermelinger, P. Karnakov, J. Šukys, and P. Koumoutsakos
Phys. Rev. Fluids 4, 063602 – Published 7 June 2019

Abstract

We investigate the collapse of a cloud composed of 12500 gas bubbles in a liquid through large-scale simulations. The gas bubbles are discretized by a diffuse interface method, and a finite volume scheme is used to solve on a structured Cartesian grid the Euler equations. We investigate the propagation of the collapse wave front through the cloud and provide comparisons to existing models such as Mørch's ordinary differential equations and a homogeneous mixture approach. We analyze the flow field to examine the evolution of individual gas bubbles and in particular their associated microjet. We find that the velocity magnitude of the microjets depends on the local strength of the collapse wave and hence on the radial position of the bubbles in the cloud. At the same time, the direction of the microjets is influenced by the distribution of the bubbles in its vicinity. We envision that the present, state-of-the-art, large-scale simulations will serve the further development of low-order models for bubble collapse.

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  • Received 29 April 2018

DOI:https://doi.org/10.1103/PhysRevFluids.4.063602

©2019 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

U. Rasthofer, F. Wermelinger, P. Karnakov, J. Šukys, and P. Koumoutsakos*

  • Computational Science and Engineering Laboratory, ETH Zurich, Clausiusstr. 33, 8092 Zurich, Switzerland

  • *petros@ethz.ch

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Vol. 4, Iss. 6 — June 2019

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